package vn.edu.uit.hotelbooking.utils;
import java.util.Timer;
import java.util.TimerTask;

import android.app.ProgressDialog;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;

public class UserLocation {
    ProgressDialog pdialog;
    Timer timer1;
    LocationManager lm;
    LocationResult locationResult;
    boolean gps_enabled=false;
    boolean network_enabled=false;

    public boolean getLocation(Context context, LocationResult result)
    {
        //I use LocationResult callback class to pass location value from MyLocation to user code.
        locationResult=result;
        if(lm==null)
            lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);

        //exceptions will be thrown if provider is not permitted.
        try{gps_enabled=lm.isProviderEnabled(LocationManager.GPS_PROVIDER);}catch(Exception ex){}
        try{network_enabled=lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);}catch(Exception ex){}

        //don't start listeners if no provider is enabled
        if(!gps_enabled && !network_enabled)
            return false;

        if(gps_enabled)
            lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListenerGps);
        if(network_enabled)
            lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListenerNetwork);
        GetLastLocation lastLocation = new GetLastLocation();
        lastLocation.run();
        timer1=new Timer();
        timer1.schedule(new GetLastLocation(), 5000);
        return true;
    }

    LocationListener locationListenerGps = new LocationListener() {
        public void onLocationChanged(Location location) {
            timer1.cancel();
            locationResult.gotLocation(location);
            lm.removeUpdates(this);
            lm.removeUpdates(locationListenerNetwork);
        }
        public void onProviderDisabled(String provider) {}
        public void onProviderEnabled(String provider) {}
        public void onStatusChanged(String provider, int status, Bundle extras) {}
    };

    LocationListener locationListenerNetwork = new LocationListener() {
        public void onLocationChanged(Location location) {
            timer1.cancel();
            locationResult.gotLocation(location);
            lm.removeUpdates(this);
            lm.removeUpdates(locationListenerGps);
        }
        public void onProviderDisabled(String provider) {}
        public void onProviderEnabled(String provider) {}
        public void onStatusChanged(String provider, int status, Bundle extras) {}
    };

    class GetLastLocation extends TimerTask {
        private Handler mHandler = new Handler(Looper.getMainLooper());

        @Override
        public void run() {
            mHandler.post(new Runnable() {
                public void run() {
                    lm.removeUpdates(locationListenerGps);
                    lm.removeUpdates(locationListenerNetwork);

                    Location net_loc = null, gps_loc = null;
                    if (gps_enabled)
                        gps_loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                    if (network_enabled)
                        net_loc = lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

                    // if there are both values use the latest one
                    if (gps_loc != null && net_loc != null) {
                        if (gps_loc.getTime() > net_loc.getTime())
                            locationResult.gotLocation(gps_loc);
                        else
                            locationResult.gotLocation(net_loc);
                        return;
                    }

                    if (gps_loc != null) {
                        locationResult.gotLocation(gps_loc);
                        return;
                    }
                    if (net_loc != null) {
                        locationResult.gotLocation(net_loc);
                        return;
                    }
                    locationResult.gotLocation(null);
                }
            });
        }
    }
    
    public void cancelTimer() {
        timer1.cancel();
        lm.removeUpdates(locationListenerGps);
        lm.removeUpdates(locationListenerNetwork);
    }
    
    public static abstract class LocationResult{
        public abstract void gotLocation(Location location);
    }
}